摘要
大田条件下 ,模拟 2 0 %的平流层臭氧层衰减时辐射到地表的紫外线B(UV_B ,2 80～ 32 0nm)的增强 ,研究了10个大豆 (Glycinemax (L .)Merr.)品种根、茎、叶和种子的稳定碳同位素组成 (δ13 C)、生物量、产量和收获指数的变化。UV_B辐射增加使所有品种的总生物量和产量分别平均下降 2 4.2 %和 2 3.3% ,10个品种的收获指数平均提高1.39% ,其中 6个品种的收获指数增加 ,4个减少。与对照相比 ,UV_B作用下 9个品种叶、茎、根和种子中稳定碳同位素 (δ13 C值 )组成降低 ,一个品种“890 7 32”各器官稳定碳同位素组成增加。δ13 C值存在器官差异 ,10个品种的对照组和处理组的δ13 C平均值由大到小的顺序是根、茎、种子和叶。结果表明 ,UV_B可能导致大豆代谢过程及代谢产物的分配发生变化。
Effects of enhanced ultraviolet-B (UV-B) radiation on growth, yield and stable carbon isotope composition (delta C-13 value) in ten cultivars of Glycine max (L.) Merr. were investigated under field conditions. Supplemental UV-B irradiation simulated a 20% stratospheric ozone depletion in Lanzhou on summer solstice day. UV-B radiation reduced biomass and yield in all soybean cultivars, by 24.2% and 23.3%, respectively. However, the harvest index increased in 6 of ten soybean cultivars but reduced in 4 cultivars, the average increment was 1.39%. As compared with control, the decrease in delta C-13 value by UV-B was observed in most cultivars, except in cutlivar '8907-32' increase was found. There were also organ differences of stable carbon isotope composition under enhanced UV-B irradiation. delta C-13 of roots was the highest and of leaves was the lowest, delta C-13 value in stem was higher than in seeds. The results indicated that UV-B enhancement might change the metabolic process and the allocation of metabolite.
基金
国家自然科学基金项目 (3 9970 12 6)
中国科学院冰芯与寒区环境研究所开放实验室知识创新项目
中国科学院天水站项目
中国科
